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Rotary tool

A technology of tools and electric tools, which is applied in the field of hand-held electric tools, can solve problems involving delays, etc.

Inactive Publication Date: 2007-10-17
BLACK & DECKER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can be achieved by braking the motor which provides rotational drive to the bit through the gearing, but there will necessarily be a delay involved as it takes time to stop the motor

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0099] specific implementation plan

[0100] The electric hammer shown in FIG. 1 comprises a motor 2 , a spindle drive train and a crank drive housed in a metal gearbox (not shown) enclosed by a plastic casing 4 . A rear handle housing equipped with a rear handle 6 and a trigger switch device 8 is fitted on the rear of the housing 4 . A cable (not shown) extends through a cable guide and connects the motor to an external power source. Thus, when the cable is connected to the power supply and the trigger switch device 8 is pressed, the motor 2 is activated to drive its armature in rotation. Metal gearboxes are made of magnesium steel with steel inserts and rigidly support the components housed within.

[0101] The drive gear 9 is press fitted onto the motor pinion 3 and has teeth which mesh with the teeth of the drive gear 12 of the overload clutch arrangement 14 to drive the drive gear 12 in rotation. When the torque transmitted between the two gears 12, 13 is below a prede...

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PUM

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Abstract

A hand held motor driven electrically powered tool, in particular a rotary hammer, comprising a spindle (40) for rotatingly driving a tool or bit (68), a spindle rotary drive train (14, 5, 10) for rotatingly driving the spindle (40) and an arrangement for detecting blocking events (16, 17). Blocking events occur when the tool or bit of the tool become rotationally fixed in the material being bored in which case the rotary drive on the spindle from the motor causes the tool housing to rotate in a, user's grip. According to a first aspect of the invention an overload clutch (14) is provided in the spindle rotary drive train for transmitting rotary drive to the spindle below a predetermined torque and slipping above the predetermined torque arranged such that the overload clutch cuts off rotary drive to the spindle, for example by reducing the predetermined torque at which the overload clutch (14) slips when a blocking event is detected so as to cut off rotary drive to the spindle in response to a blocking event being detected. According to a second aspect of the invention there is provided a mode change mechanism (45, 47, 49, 43) for selectively disengaging a clutch (10, 7) so as to cut off the rotary drive to the spindle (40) and the clutch is disengaged when a blocking event is detected so as to cut off rotary drive to the spindle in response to a blocking event being detected.

Description

technical field [0001] The present invention relates to a hand-held power tool having a rotationally driven tool or drill, and more particularly the present invention relates to a powered rotary hammer tool. Background technique [0002] Rotary hammers typically have a housing and a hollow cylindrical spindle mounted within the housing. The spindle allows the shank of a tool or drill such as a spade drill or percussion drill to be inserted into its front end so that it remains in the front end of the spindle and is somewhat axially movable. The spindle may be a single cylindrical part, or it may be made of two or more coaxial cylindrical parts which together form the hammer spindle. For example, the front portion of the spindle may be formed as a separate tool holding body for holding a tool or drill bit. [0003] These electric hammers are provided with an impact mechanism for converting the rotational driving force from the motor into a reciprocating driving force for dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25F5/00B25D16/00B23B45/00F16D7/10F16D43/208B23Q11/04F16D7/08F16D43/206
CPCF16D7/10F16D7/08B23Q11/04F16D43/208B25D2211/003F16D43/206B25F5/00
Inventor 米夏埃尔·斯特姆马丁·劳特瓦尔德斯蒂凡·D·根斯曼诺贝特·哈恩罗伯特·艾伦·乌泽尔曼阿希姆·容罗伯特·布拉杜斯
Owner BLACK & DECKER INC